Rotary-hearth furnace



` July 22, 1930. o, A. COL'BY 1,770,970

' ROTARY HEARTH PURNACE Filed Deo. 7. 192B 3 Sheets-Sheet l INVENTOR Ora A. CO/by 'ATTORNEY July 22, 1930. o. A. coLBY -Ro'rARY HEARTH FURNACE Filed Dec. 72, 1928 3 Sheets-Sheet 2 INVENToR Ora A. CU/b] ATTOR N EY July 22, A r Q A. COLBY ROTARY HEARTH FURNACE Filed Deo. 7, 1928 3 Sheets- Sheet 3 :NvENToR Ora A. Co/by A'TT'ORNEY Y u1 ,'.theetendency `Patented'July` 22,

One objectV of my inventionyis,-thereore In 1 practicing my invention;-liprovideyinf fa rotaryihearth YffllrnaCeQ-i ai? pluralf-tyebfwtlt-w able hearthr ftrays mounted uponf la Qftable Y annular hearth] fsll'lcture. means Eenftiltingg 2 0 saidMtr-ays in sequenee,andmeansfgdirectlygf carried ."'hytV the tray-tilting,gmeohanism and operative: atv substantiallythe :lirriitaof the tilting: movement of trayz foriimparting afsud den blow-vte. the trayg coffloosenthe` materiale l This application-'is'la/substitutefin part fory Y Vappli'cants -v earlier;,.aplioationf Serial j No5- r 227,455; led 'OotoberwQObf,1927;. ,Wh-ich? appli,-t cationlbecarneiabandoned before the #present applicationWaslilednij f In the draw-ingsgEig'urel'is-aivievh inverstical section; through@ a rotary-hearth f fur# nace.'enuloodyinganyyinventiong` K Figi-2 is a de'tail viewfof' thetraytilting: jarring lmeans portionsfof fthevtrayfand VKfurnace structure:being-j.broken!away;f i

Fig; 3 -isva vievvfi-n-:sectiongi.takenxonlthe Y Figsfis afview?, finfhorizontalsection; through a rotaryfhearthfurnace-embodying myinventionyand; 1:5

Eig;Y 5 is 'fa view;in"sidelelevation;r of fa furl: naceembodyingimyqinvention. j

45 lRefelfr-inggrnomapartimlanlyftorFiglofthe lowerfendgf With'fsw .q suitable fv eonvey or:`v or*V queichiltankfdnotpshomn);j '901'5 i j dra-Wings,ghavefshown: niy inventionfas false', 'pliedto-airotary-hearthiurnaege 11V Compris-7y ingr 'annular ffsider and `topr Weal-lsy-built olf-fre` fractoryq material in 'af Well-.known manner 'andflsuppor'ted i,1infoperative" `'relation @upon "ai l de nt'rahy standard' $123; and fa i frnetafl'lie router. shield-113; The particular details-of lconstrucl itionrolf the' urnaCe'vvallsand-top eonstitutie lno; part :jf of!l myt invention; and are, Ithere-fore,y

shownffor illii'str'ativeipurposesonly.:v r

offthe furnaeefjcha-Inber 'andflisrisul)sta-taally-v ported@` :upon anrannular rloas'esplateA l'r; The` i heartht stnuctureis supported?. rifnit's operative 17that-iare :journallediinnlonaoketsrlSwith Which thefstand'ard. 12 is` provided, 'thebase;

restkv upon; therollerszf` rAplunalityvotihearing rollersaQlnare Clarrie'd'byj'the base'r plated@` to .engagenthef.I router fperipheral surf'ee oi the v horizontal posit/ioniu off'the hearth 14, to cooperate: :vviiuhfvdepend ing annular Hanges'lson thiefstationaryfurnacev structure to oonstitu-t'sandfsealsins the usual u a door 26 which isvertically:'movaloleffby,

4'erated' 'by*mechanismrfsulostantiallyv :like fthat Whichis'femployedto'operate the door 26H13; A a

discharge chiite Mis.-providedimmediately L belowthe v'opening"32" to communicate; at its drawings.'

Y' the hearth and the trays;`

, A`The Vrod44 extends through Any means for heating the furnace chamber may be employed, but I prefer, 1n the present embodiment, to employ electrical-resistance elements 36 which areinounted upon 5 the side walls of the chamberr 24 in any suitmounted on the upper face of thehearth 14 and are uniformly spaced circumferentially thereof. f The'trays are severally pivoted at 38 to permit a tilting movement thereof, .as shown on the left-handside of Fig. 1 of the The hearth ends, means being provided for-closingthe otherwise open ends, `such means b'eingav single annular. member 39,ypreferably made of sheet metal. "The annulus 39 is provided with a plurality`V of peripherally-spaced fre# cesses 41in its lowerpedgewhich are so loi', v cated asto'receive the side walls'of -the correspondingly spaced trays. VThat-is, the two adjacent sidewalls of two adjacent peripherally-spaced ,hearth-trays' 37 fit into one of the recesses 41, so that the member 39 is sup-V ported by all of the hearth'trays and, therefore, rotates therewith. v'lhefdiameter of Vfthe 1 annulus 39fisrma'de such that Ait willl rest upon the outer ends ofthe' trays lor closely adjacent thereto .in order lthat such louter ends may be'closed to normally prevent movement 'therefrom of material located 1n the trays` during the "rotative *movement of Tiltingof the` hearth traysis effected by means of a'bar. 42 pivotally mounted upon` the lower end ofa' depending link 43 the upper end'of which is connected'to a horizontallyv extendingact'uating lever 46 by a suitable rod 44. `The bar 42 is pivotally .mounted on a pivot pin 47 with which the link 43 vis pro'v vided and is located in a recessin the lower1 end'. of the link 43 in such `manner that it is prevented from turning' in a 'counter-clock-v wise direction. The lever 46 is' pivotally mounted, at its other end, on' a vbracket '48 which is mountedon vthe furnacestructure. The lever 46 may move vertically upwardly orE downwardly in 'a guide member49 which extends vertically upward and is also mount`v ed'onithe furnace structure. i The lever 46 is moved vertically by means ofa cam 53 having a groove 52 which is engaged by a roller 51 secured to the lever intermediate its ends, the cam being driven byan electric motor` 54 and 'suitable` speed-reduc-A ing gear mechanism 56 y a f suitable sand seal or stuffing box 57 niounted'in the top Aofthe furnace structure. v'The operation of the tilting mechanismissuch that the tray is inthe tilted position shown in the left-handVA e side of Fig. 1 of the drawingsat'thellimiteof:

the upward movement of the rod 44, and the l subsequent downward movement thereof efnormal horizontal position.

It is to be understood, of course,`that suitv able control means for the motor 54 will be provided in order that the trays may be tilt-Vv outer end of the bar 42 during the larger poru A l A j tion'of the movement oflthelink 432 A metal' trays are open at their outer fects the gradual movement of the tray to itsA frame 59,.which is'located in'tliinner wall of A.thefiiriiacel structure, has a vertical slot 61 length that the upper surface of the rearwardly-'extending portion "-62 will strike its upper wall at substantially the upper limit of` travel of the rod 44 irrorder' that the bar 58 maybe given a sudden-movement in-a'clock-- wise direction to strike the` lower surface of f the tray4 adjacent toits vinner end' and thus jar thesame. '1 'A f suitable or desiredkindgj' A 'Y Assuming, thatlthe rotation of thatone ofthe hearth trays'37is in align'i'nent with the discharge chute 34,the trayftilting'- motor energized to raise the rod 44'suiiic1e'ntly,throughthe operation offgthe iii'terveii" ing mechanism,'to cause the bar 42: to engage the bottom ofthe particulartray in align-mentY with the chute andjtilt4 it uponitsbeai'ings 38; f D'uring the upward movement of 'the yrod 44, theouter porti'oii ofthe pivote'd'bar 58 is out of engagement jwith the tray`37, but, as the rod44 approaches the limit of its upward movement, the extension 62 ofthe hook strikes the stop' constitutedbythe 'upper wall ofthe slot 6l and swings the'outer portion ofthe bar58 into sudden engagement withv the b ot tomof the tray 37. :In view of thediifferenty lengths of the lever arm'of the extension 62l and that of the other portion of the bar 58"fromthe pivot pin 47 the tray will be forcibly jarredv by this'a'ction, and any heated material mounted on thev traywill be loosened therefrom-'to slide down thedischarge chute 34 to either: a conveyor o'r a' quench tank.

' Myinvention thus provides ameanspiv? otally mounted on a tray-tilting nieansfoi'" ]arringA the tray when at substaiitially'the upper end of its verticalmovement to-efect loosening ofthe material thereon. Thez jarring means is carried' directly by, and is'pivotally mounted on, .the tray-tilting means.

'.-WVhile I have illustratedand descrbedmy for receiving a rearwardly-extending por- :tion 62 ofthe bar58agafl`he slot 61 is of such v the hearth; has been vstopped by any suitable means and;

1 rf i 1,776,970

` inventionY asjapplied toa rotary-hearth furlnace of a partioular desiUn, it is' obvious,j it 'y is aplilicable'to furnaces o? other types'vvhere-A-` in the material-supporting trays arel tilta'ble to effect lthe discharge of material therefrom,

Various modiiications mayf be` made in theidevice embodying my invention Without departing from the "spirit andscopeithereof,

Y and I desire, therefore, that only such limi-k `by the prior art or tationsV shall be placedthereon as areimposed g are set forth in' the'apf f pended claims;Y l I Vclaim as myV 1nvent1on:

ment offmaterial located onsaid tray out-1 f Wardlyftherefiom under 'said annular strip, y

fsaid'jarring means embodying va lever'pivoted l on the'tray-tilting-means, and means in said furnace-jte. Vcause Vit to operatively Aengage a 70:. -V

tray 4atfsubstantially]` the end iofits tilting movement only.

Sei-bed .my mev thisv zr'day 'of November 192,8. .Y

\ I In a heat-treatingfurnace, the. combi-4 nation with a plurality ofhearth trays .movable through saidv furnace,; and movable l means fortilting said traysfsuccessivelyto Y effect the discharge of materialtherefrom, Y

Of means pivoted Idirectly fon said Vmovable i tiltingmeans and normallyout 'of engage; Vment with a tray during the :tilting movef ment thereof, and means including an alout- 3 Vment on a Wall of said `furnace adapted to be jv engagedby said pivoted means tomove it into sudden engagement With the tray being vtilted i at, Substantially theenaof lits tilting movei ment toeffect .jarring thereof.

*pivoted to said tilting means landnormally" f 25 Ina furnace, the combination With a the tiltingthereof, of meansforv jarring said tray during 'the' tilting movement thereof to effect the dislodgment therefrom of material Carried thereby, said means comprising abar out of engagement with 'said tray and means pvoted hearth tray'and means for effecting i Y in the path of movement of said tilting means l i i l for swinging said bar-fintol engagement WithV saidv tray. e

,3. In a furnace, the combination With a` pivoted hearth tray and meansfor efectin the tilting thereof. of means for jarring sai tray during the tilting movement thereof to v A effect the dislodgment therefrom-of material carried thereby,said last-mentioned means comprising a' bar pivotedintermediate the e ends` thereof to said tilting means and normally out of engagement Withsaid tray and means secured to said furnace Wall in "they e path of movement of the portion of said piv-- oted barremote from said tray for bringing said bar into sudden engagement with said tray, e In an annular heat-treating lfu`rnace,`the

l combination with an annularV support, a plu-l n rality of hearth trays on said supporthaving V i A ORAAI." CQLY? In testimony-whereof,I-havehereuntosub i n 

